The Atreus

Until you see an Atreus in person, it's hard to comprehend just how compact it is. But don't let that tiny package fool you. This is a real mechanical keyboard, with full-travel keyswitches mounted in an anodized aluminum plate and the same generous 19mm key spacing you'll find on a traditional desktop keyboard. Inside, it's powered by the same chip that's inside an Arduino Leonardo. It's completely customizable and comes with firmware source code, as well as a graphical configuration tool.